/Engine/Source/Editor/UnrealEd/Public/EditorViewportClient.h
This set ups camera for both orbit and non orbit control
void SetCameraSetup ( const FVector & LocationForOrbiting, const FRotator & InOrbitRotation, const FVector & InOrbitZoom, const FVector & InOrbitLookAt, const FVector & InViewLocation, const FRotator & InViewRotation )